<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Document</title>
        <script src="./js/刷新页面.js"></script>
    </head>
    <body>
        <input type="button" id="btn1" value="百度"><span id="time">3秒后开始跳转</span><br>
        <input type="button" id="btn2" value="刷新">
    </body>
</html>